Rotary reamer



Se t. 29, 1925. v r H. H. JONES ROTARY REAME'R Filed June 26, 1924 Y Q Q x-----R 5 JVENTOR.

Harry M r /0/7c;9

A TTORNEYfi Fatented Sept. 29, 1925.

ITED STATES HARRY H. JONES, or rutnnnrolv, camromvm.

noranv REAMER.

Application filed June 26, 1924. Serial 110,722,458.

' T o'a-ll whom it may concern: I

citizen of the United States, and resident of- Fullerton, in the county of Grange, State.

Be it known that I, HAnnY'H. JoNns, a

of Galifornia,'have -i nvented new anduseful Improvements in a Rotary Reamer, of which the following is a specification. This invention relates to well drilling and pertains to a cutting tool having a guide for insuring the cutting of a straight hole.

When drilling with rotary bits or rock drills, especially in large-holes, itis difiicult and'often impossible to jprevent the drills or bits from dodging or sidetracking. around boulders or hard spots and producing a zigzag hole. It is difficult and somet mes 1H1- possible to insert a casing in such a hole.

' or connections.

Ft then becomes necessary to ream and.

- said flexibility is not present, there isa great ceive a lock nut later described.

tendency for the drill pipe or rod to break at its point'of connection with theguide. In addition to the broader objects of t is invention, there are certain details of construction which insure an economical, simple, easily manipulated, and durable structure.

These objects together with other objects and corresponding accomplishments are ob tained by means of the embodiment of my invention illustrated in the accompanying drawing, in which:

The figure is an axial section through a complete reamer. v

Referringinore particularly to the drawing, the usual drill pipe or stem is indicated by 1. The stem is connected by atool joint 2 to a special drill collar 3. The collar is internally threaded at its lower end to receive the tapered end of a bit or other cutting tool. it is reduced in diameter at the lower end and externally threaded to re- In the I present instance, 1 have shown fish tail bit 4 mounted upon the end of the drill collar. The construction just described is that well known in the drilling art, wherein, circulation fluid may be supplied through the drill .pipe and bit to wash away the cuttings.

Mounted over the drill pipe and collar is my guide consisting of a slip bushing 5 liaving a bore through which the drill pipe is passed. There is a clearance between the bore of the bushing andthe drill pipe sufficient to provide a loose fitand to permit flexing of the drill pipe through the bushing. Eyebolts 6 are mounted upon the bushing for convenience in handling the latter. The bushing is externally threaded for securing a collar 7 thereto. A joint 8 of casing is secured 'to.the collar and is of substanlially the same diameter as the hole being drilled. In order to prevent the casing backing off, pins 9 are inserted through: the collar 7 and casing '8. A special sleeve or reducing bushing 10 is secured to the bottom of the casing 8 and snugly engages the reduced portionof the drill collar.

Mud holes 11 are provided to drain out any mud entering the guide shell 8. A look nut 12 is mounted upon the bottom of the drill collar securing the guide in place and is pinned to-the bushing 10. l

It is obvious that the gulde will occupy a space within the hole, brace itself and maintain the drill pipe and associated parts in a straight line advance. The clearance between the bushing 5 and. drill pipe is sufficient' so that there is no bending strain concentrated at the point of entrance of the drill pipe through the guide or bushing.

The method of operation of the device in reaming and straightening a hole is obvious. The slush for circulation is delivered by the pump at the point the work is being done the same as when a new hole is being drilled. In case boulders or inclinedfha'rd formations are encountered, the reamer may be used to insure a straight hole in initial drilling, but this will not be advisable except in special cases.

What I claim is:

l. device of the character described said steni, said stern being secured to said cutter for rotation of the latter and extending upwardly beyond said shell.

2. A device of the character described comprising the combination of a rotary cutter having an operating stem, a relatively long guide shell of substantially. the same diameter as the bore to be cut mounted on said stein, there being a snug fit between said stem and said shell adjacent the cutter and a loose fit between said stem and said shell adjacent the upper end of the latter so as to permit liexure of said stein, said stem being secured to said cutter for rotation of the latter and extending upwardly beyond said shell.

3. A device of the character described comprising the combination of a rotary cut-v ter having an operating stem, a tubular relatively long guide shell of substantially the same diameter as the bore to be cut, bushings at the upper and lower ends of said shell, the upper bushing providing a loose fit with said stem so as to permit fiexure thereof, the lower bushing snugly fitting said stem so as to securely holdthe latter, said stem' being secured to said cutter for rotation of the latter and extending lip- Wardly beyond said shell,

i. A device .01 the character described comprising the combination of a cutter havrotation of said cutters.

ing a drill collar secured thereto and a drill pipe secured to said collar, a joint of casing of substantially thesame diameter as the hole bored by said cutter disposed about said drill collar and drill pipe, a slip bushing secured to the upper end of said casing and having a bore loosely fitted to said drill pipe, a slip bushing and reducer secured to the lower end of said casing and having a bore snugly fitted to said drill collar, said drill pipe being secured to said collar for 5. A device of the character described comprising the combination of a cutter, a drill collar secured thereto and reduced in diameter at the'lower end thereof, a drill pipe secured to said cellar, a joint or" casin disposed. about said drill collar and dril pipe, a slip bushing secured to the upper end of said casing and having a bore loosely fitting said drill pipe, a slip bushing and reducer secured to the lower end of said casing and mounted on the portion of said shinny n. JONES, 

